^Except there's very little difference in how the characters are portrayed. Spock, Sulu, and Uhura deliver largely the same dialogue as Nessus, Jason, and Anne Marie and perform the same actions. The main difference is that the human characters aren't married in the TAS version. There are some plot details trimmed from the adaptation, mainly that the weapon was built by the Tnuctipun resistance rather than the Thrintun/Slavers themselves, but for the most part it's a remarkably faithful adaptation.
What's interesting to me about Foster's novelization, though, is that he doesn't reference Niven's original at all. I would've thought he'd be familiar with his colleague's work and fold some of the elided detail back in, but instead he fleshed out the story in his own independent way.